Also changing the first capture to non-greedy should not affect the number of results (regexp is anchored on both sides), yet it does (for z? case, things work OK without it): 
perl -e '"01234" =~ /^(.+?)(.+)((?:.z?)+)$(?{ print "$1 $2 $3\n" })(*F
+AIL)/'
0 123 4
0 12 34
0 1 234
01 23 4

[download]
It looks like a bug. It smells like a bug. It ate my whole project. But... Is it a bug?

In reply to Re^2: Bug with finding all regexp matches by Anonymous Monk
in thread Bug with finding all regexp matches by Anonymous Monk

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